A Prototype of the 20th Anniversary Mac

Seen on eBay, a prototype of the 20th Anniversary Mac. The seller states that it does not work and comes without accessories, so the asking price ($5,900) seems a bit high to me.

Visually, it looks like the one owned by Henry Plain. A lighter model with dark speakers has already been seen on this page and on his website.
Notable details include dark speaker fabric, no markings on the front, an incomplete optical drive button, and a sticker indicating it is a prototype. However, without the subwoofer that also serves as a power supply, diagnosing the issue seems difficult, and the accessories are also missing.


The sticker indicating it’s a prototype


Some marker writing with information is visible


The cable is in poor condition